<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

</body>
<script>
    let {a:hello}={a:'aaa',hello: 'bbb'};
    console.log(hello)
    var name="A";
    console.log(`Hello ${name}`)
    var i =[1,2,3].map(item=>2*item);
    console.log(i)
</script>
</html>